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Resolved Gaia Triples
Tokovinin, Andrei
A sample of 392 low-mass hierarchical triple stellar systems within 100 pc resolved by Gaia as distinct sources is defined. Owing to the uniform selection, the sample is ideally suited to study unbiased statistics of wide triples. The median projected separations in their inner and outer pairs are 151 and 2569 au, respectively, and the median sepa…
Hard X-ray luminosity functions of cataclysmic variables: joint Swift/BAT and Gaia data
Doroshenko, Victor; Suleimanov, Valery F.; Werner, Klaus
Cataclysmic variables (CVs) are the most numerous population among the Galactic objects emitting in hard X-rays. Most probably, they are responsible for the extended hard X-ray emission of the Galactic ridge and the central Galactic regions. Here, we consider the sample of CVs detected in the all-sky hard X-ray Swift/BAT survey, which were also de…
The Intermediate-ionization Lines as Virial Broadening Estimators for Population A Quasars
Piconcelli, Enrico; D'Onofrio, Mauro; Martínez-Aldama, Mary Loli +10 more
The identification of a virial broadening estimator in the quasar UV rest frame suitable for black hole mass computation at high redshift has become an important issue. We compare the H I Balmer H β line width to the ones of two intermediate-ionization lines: the Al III λ1860 doublet and the C III] λ1909 line, over a wide interval of redshift and …
Eclipse mapping of EXO 0748-676: evidence for a massive neutron star
Ingram, Adam; Middleton, Matthew; Knight, Amy H. +1 more
Determining the maximum possible neutron star (NS) mass places limits on the equation of state (EoS) of ultra-dense matter. The mass of NSs in low-mass X-ray binaries can be determined from the binary mass function, providing independent constraints are placed on both the binary inclination and mass ratio. In eclipsing systems, they relate via the…
A new look at the frequency-dependent damping of slow-mode waves in the solar corona
Nakariakov, Valery M.; Kolotkov, Dmitrii Y.
Being directly observed in the Doppler shift and imaging data and indirectly as quasi-periodic pulsations in solar and stellar flares, slow magnetoacoustic waves offer an important seismological tool for probing many vital parameters of the coronal plasma. A recently understood active nature of the solar corona for magnetoacoustic waves, manifeste…
A multiwavelength study of the W33 Main ultracompact HII region
Menten, K. M.; Khan, S.; Wyrowski, F. +7 more
Aims: The dynamics of ionized gas around the W33 Main ultracompact HII region is studied using observations of hydrogen radio recombination lines and a detailed multiwavelength characterization of the massive star-forming region W33 Main is performed.
Methods: We used the Giant Meterwave Radio Telescope (GMRT) to observe the H167α recomb…
A Simple Radial Gradient Filter for Batch-Processing of Coronagraph Images
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +1 more
Images of the extended solar corona, as observed by different white-light coronagraphs, include the K- and F-corona and suffer from a radial variation in intensity. These images require separation of the two coronal components with some additional image-processing to reduce the intensity gradient and analyse the structures and processes occurring …
OGLE-2018-BLG-0799Lb: a q 2.7 × 10-3 planet with Spitzer parallax
Maoz, Dan; Han, Cheongho; Udalski, Andrzej +73 more
We report the discovery and analysis of a planet in the microlensing event OGLE-2018-BLG-0799. The planetary signal was observed by several ground-based telescopes, and the planet-host mass ratio is q = (2.65 ± 0.16) × 10-3. The ground-based observations yield a constraint on the angular Einstein radius θE, and the microlensi…
Over-expansion of coronal mass ejections modelled using 3D MHD EUHFORIA simulations
Poedts, Stefaan; Scolini, Camilla; Schmieder, Brigitte +5 more
Coronal mass ejections (CMEs) are large scale eruptions observed close to the Sun. They are travelling through the heliosphere and possibly interacting with the Earth environment creating interruptions or even damaging new technology instruments. Most of the time their physical conditions (velocity, density, pressure) are only measured in situ at …
Tracking the 3D evolution of a halo coronal mass ejection using the revised cone model
Zhang, Q. M.
Aims: This paper aims to track the three-dimensional (3D) evolution of a full halo coronal mass ejection (CME) on 2011 June 21.
Methods: The CME results from a nonradial eruption of a filament-carrying flux rope in NOAA active region 11236. The eruption was observed in extreme-ultraviolet (EUV) wavelengths by the extreme-ultraviolet imag…